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Pickups Diesels Chevy Silverado and GMC Sierra Duramax Fuel Mileage
506 messages, Last post on Nov 30, 2009 at 5:21 PM
You are in the Diesels Forum. Your Host is kcram
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| I have a 2005 Silverado 2500 HD 4x4 6.6 Diesel and I purchased it to help save on my towing gas. However I am only getting 6-10 MPG while towing at 65-75 MPH. I tow a Tag hitch 30' enclosed race car trailer triple axle approx 12,000 lbs. loaded, but rated for 15,600 lbs. Can anyone tell me why I am getting such horrible fuel mileage? and please explain to me what "break in" means for a diesel. Thanks! | |
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Replying to: sleadhead44 (Aug 16, 2005 1:13 pm) The issue with towing is frontal area more so than weight, especially at those speeds. The horsepower it takes to overcome the drag varies as the cube of mph, so slowing down a little will save a lot. Drag varies linearly with the frontal area and the drag co-efficient so those are two important factors also. |
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| I just purchased a '05 4x4 crew cab GMC duramax. Previously had same truck('03) but gas. I want to maximize/improve fuel mileage. I've seen AMSOIL lubricants mentioned to improve mileage. What applications work best? | |
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Replying to: aarongd (Aug 05, 2005 6:55 pm) I leveled my 05 Crew Cab D-Max 4x4 by replacing my torsion bar keys as well, and have experienced the same rough ride, expecially when going over a speed bump. It feels as if the front shocks are "topping out" when they are fully extended. Someone said I should replace the stock shocks with a longer Blistien shock. Any ideas? Also, did you notice your mpg go down after you leveled? I am trying to figure out how all these people here are getting such great economy, when I average about 11.5 in the city, 13.5 hwy, and 7.5 pulling a heavy load. It is from the front end not slicing into the wind by being up an additional 2.5 inches, or the 285/75/16 tires?
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Replying to: sleadhead44 (Aug 16, 2005 1:13 pm) truck quit 3 times in colorado, pulling under 10000 lbs. found bad injector module after 3 trips to dealer. $1000 bill for gm. Same thing happening again. Starts combustion knock, severe, quits but restarts. Contacted GM 8 times to help, customer no service helpful not. |
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Replying to: stoneg (Jul 22, 2005 6:49 pm)
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| I have a 04 with the LLY. Has anyone had a problem with the Cold High Idle not working? If I do the pedal pattern in the manual the computer does not recognize me doing anything(I have a plain jane truck with out the steering wheel controls). With the edge and magna flow exhaust I am getting 18 to 19 MPG if I keep the settings on economy and the tach below 2100 or so. When that turbo spools up bye-bye economy. | |
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Replying to: rogueservices (Sep 06, 2005 1:27 pm) Have you replaced the stock exhaust or the air intake? I have been told by a diesel specialist to wait until I had between 5-10k on mine before I did the Edge or the Banks (I'm torn between them), but did say that when I do it, be sure to get a bigger exhaust (4"). I was told by an equal number of people that the cold air intake wouldn't show much of a difference over the K&N filter in the standard air box. So I just added the filter, and I might be getting about 1 mpg better. |
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Replying to: blackmax (Sep 19, 2004 1:26 pm) Anyone have experience with it?
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Replying to: fxwg82 (Sep 13, 2005 9:25 pm) On this rig I also put removed the muffler and installed a split, dual exhaust w/5" chrome tubes.
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